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WAEC Chemistry 2022 Paper

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Question : 14

Total: 50

A colourless gas with a pungent smell is evolved when dilute hydrochloric acid is added to a sample of a salt. The gas evolved could turn

acidified K2Cr2O7 solution colourless.
acidified KMnO4 solution colourless.
Fe(NO3)2 solution green.
Pb(NO3)2 paper black.

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